Alright, let's solve this math problem step by step. First, we have the number 387. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 80. So, we're going to take the number 387 and add it to itself 80 times.
Step 1: 0 + 387 = 387
Step 2: 387 + 387 = 774
Step 3: 774 + 387 = 1161
Step 4: 1161 + 387 = 1548
Step 5: 1548 + 387 = 1935
Step 6: 1935 + 387 = 2322
Step 7: 2322 + 387 = 2709
Step 8: 2709 + 387 = 3096
Step 9: 3096 + 387 = 3483
Step 10: 3483 + 387 = 3870
Step 11: 3870 + 387 = 4257
Step 12: 4257 + 387 = 4644
Step 13: 4644 + 387 = 5031
Step 14: 5031 + 387 = 5418
Step 15: 5418 + 387 = 5805
Step 16: 5805 + 387 = 6192
Step 17: 6192 + 387 = 6579
Step 18: 6579 + 387 = 6966
Step 19: 6966 + 387 = 7353
Step 20: 7353 + 387 = 7740
Step 21: 7740 + 387 = 8127
Step 22: 8127 + 387 = 8514
Step 23: 8514 + 387 = 8901
Step 24: 8901 + 387 = 9288
Step 25: 9288 + 387 = 9675
Step 26: 9675 + 387 = 10062
Step 27: 10062 + 387 = 10449
Step 28: 10449 + 387 = 10836
Step 29: 10836 + 387 = 11223
Step 30: 11223 + 387 = 11610
Step 31: 11610 + 387 = 11997
Step 32: 11997 + 387 = 12384
Step 33: 12384 + 387 = 12771
Step 34: 12771 + 387 = 13158
Step 35: 13158 + 387 = 13545
Step 36: 13545 + 387 = 13932
Step 37: 13932 + 387 = 14319
Step 38: 14319 + 387 = 14706
Step 39: 14706 + 387 = 15093
Step 40: 15093 + 387 = 15480
Step 41: 15480 + 387 = 15867
Step 42: 15867 + 387 = 16254
Step 43: 16254 + 387 = 16641
Step 44: 16641 + 387 = 17028
Step 45: 17028 + 387 = 17415
Step 46: 17415 + 387 = 17802
Step 47: 17802 + 387 = 18189
Step 48: 18189 + 387 = 18576
Step 49: 18576 + 387 = 18963
Step 50: 18963 + 387 = 19350
Step 51: 19350 + 387 = 19737
Step 52: 19737 + 387 = 20124
Step 53: 20124 + 387 = 20511
Step 54: 20511 + 387 = 20898
Step 55: 20898 + 387 = 21285
Step 56: 21285 + 387 = 21672
Step 57: 21672 + 387 = 22059
Step 58: 22059 + 387 = 22446
Step 59: 22446 + 387 = 22833
Step 60: 22833 + 387 = 23220
Step 61: 23220 + 387 = 23607
Step 62: 23607 + 387 = 23994
Step 63: 23994 + 387 = 24381
Step 64: 24381 + 387 = 24768
Step 65: 24768 + 387 = 25155
Step 66: 25155 + 387 = 25542
Step 67: 25542 + 387 = 25929
Step 68: 25929 + 387 = 26316
Step 69: 26316 + 387 = 26703
Step 70: 26703 + 387 = 27090
Step 71: 27090 + 387 = 27477
Step 72: 27477 + 387 = 27864
Step 73: 27864 + 387 = 28251
Step 74: 28251 + 387 = 28638
Step 75: 28638 + 387 = 29025
Step 76: 29025 + 387 = 29412
Step 77: 29412 + 387 = 29799
Step 78: 29799 + 387 = 30186
Step 79: 30186 + 387 = 30573
Step 80: 30573 + 387 = 30960

So, 387*80 = 30960